I think the cell phone script should have some extra things such as,
Phone number, so you cant be called by random people you don't want to be bothered by, you can only be called if they know your number.
Message system, so if you don't pick up or you reject they can leave a message, and if you call the message system you can read the messages.
Also, these ones aren't as important, but you could kinda have a "plan system" which offers a price per X amount of calls (example $15 dollars every 5 calls) and you can upgrade/downgrade whenever you want.
Enough with that...
As a general script suggestion, all commands instead of using ! should use / so the screen isnt cluttered up with commands and cops dont sus you for using commands for things like !growweed unless they see you playing in the weed fields.
-jay